阅读说明：本技术 具有过滤装置的深井泵 (Deep-well pump with filter device ) 是由 陈宜文 吴培祥 熊坤亮 于 2021-08-16 设计创作，主要内容包括：本发明公开了带过滤装置的深井泵,解决了现有深井泵在实际的应用过程中对外界掉落到水中的颗粒防护效果差的问题,所采取的技术方案：一种具有过滤装置的深井泵,包括控制器、传动联接的电机和提水装置,电机设置在机筒内,在机筒的下端侧设置有用于对电机转子进行支撑的支撑装置；提水装置设置在上筒内,上筒和机筒通过联接架而实现同轴联接固定,上筒上设有朝向联接架的进水口。该过滤装置包括圆环形的防沙筒,防沙筒间隙地套接在深井泵的外周,防沙筒上端与上筒之间设置有密封结构,所述的进水口位于防沙筒的轴向长度范围内,防沙筒的下端向下至少延伸到机筒位置处,防沙筒的内径大于机筒的外径,防沙筒与机筒之间的间隙与所述的进水口相通。(The invention discloses a deep-well pump with a filtering device, which solves the problem that the existing deep-well pump has poor protection effect on particles falling into water from the outside in the practical application process, and adopts the technical scheme that: a deep well pump with a filtering device comprises a controller, a motor and a water lifting device, wherein the motor is in transmission connection with the water lifting device; the water lifting device is arranged in the upper barrel, the upper barrel and the machine barrel are coaxially connected and fixed through the connecting frame, and the upper barrel is provided with a water inlet facing the connecting frame. The filtering device comprises a circular sand prevention cylinder, wherein the sand prevention cylinder is sleeved on the periphery of a deep-well pump in a clearance mode, a sealing structure is arranged between the upper end of the sand prevention cylinder and an upper cylinder, a water inlet is located in the axial length range of the sand prevention cylinder, the lower end of the sand prevention cylinder at least extends downwards to the position of a machine barrel, the inner diameter of the sand prevention cylinder is larger than the outer diameter of the machine barrel, and the clearance between the sand prevention cylinder and the machine barrel is communicated with the water inlet.)

1. A deep well pump with a filtering device comprises a controller, a motor and a water lifting device, wherein the motor is in transmission connection with the water lifting device; the water lifting device is arranged in the upper barrel, the upper barrel and the machine barrel are coaxially connected and fixed through the connecting frame, and a water inlet facing the connecting frame is arranged on the upper barrel.

2. The deep-well pump according to claim 1, wherein a water outlet pipe is coaxially provided at an upper end portion of the upper cylinder, the water outlet pipe is communicated with an inside of the upper cylinder, and the sealing structure is coupled and fixed to the water outlet pipe.

3. The deep-well pump according to claim 2, wherein said sealing structure comprises a rubber pad, a through hole is provided in the rubber pad along the axial direction of the upper cylinder, a nut is embedded in the rubber pad, and a screw is threaded through the wall of the sand-proof cylinder to be connected with the nut.

4. The deep well pump boot of claim 3, wherein the two rubber pads are disposed opposite to each other, and the two rubber pads are respectively provided with a semi-cylindrical groove on opposite side surfaces thereof, and the two side surfaces are attached together so that the two grooves form the through hole.

5. The deep-well pump of claim 4, characterized in that the circumferential surface of the rubber pads is provided with a ring groove, in which a hoop is provided, the walls of the hoop protrude outwards to form a U-shaped structure, and when the two rubber pads are fitted and fixed, the U-shaped structure is clamped by a clamp to tighten the hoop.

6. The deep-well pump of claim 1, further comprising an external inductive head electrically connected to the controller through a wire, wherein the wire passes through the sealing structure and extends out of the sand prevention cylinder, and the inductive head corresponds to the upper cylinder in position under the suspension of the wire; the upper barrel is electrically connected with the controller.

7. The deep-well pump according to claim 6, wherein the sand prevention cylinder is electrically connected with the controller, a sheath is sleeved on the periphery of the induction head, a plurality of through openings are formed in the sheath, and the sheath realizes the separation between the induction head and the sand prevention cylinder.

8. The deep-well pump of claim 1, wherein the support means comprises a cylindrical support sleeve, a blocking structure provided on the barrel axially blocks a closed end of the support sleeve, an open end of the support sleeve supports the support structure, and a bearing sleeved on the rotor shaft is provided on the support structure; the outer peripheral surface of the supporting sleeve is attached to the inner peripheral surface of the machine barrel, and the oil passing structure is communicated with two ends of the supporting sleeve.

9. The deep-well pump according to claim 8, characterized in that said support structure comprises a cylindrical support cylinder, the bearing being arranged on the inner bottom surface of the support cylinder, the rotor shaft being inserted into the support cylinder from the open end of the support cylinder.

10. The deep-well pump according to claim 9, wherein the wall body of the open end of the support sleeve is provided with a plurality of notches, and oil grooves are provided on the outer circumferential surface of the support sleeve in the axial direction thereof corresponding to the positions of the notches.

Technical Field

The invention relates to a deep-well pump, in particular to a deep-well pump with a filtering device, which can block particles sinking from the water surface of a water source area.

Background

Deep well pumps are used at relatively deep water sources, particularly deep water wells, for lifting water high. The deep-well pump is normally suspended through the lifting rope in the working state, and is half suspended below the water surface, and the deep-well pump cannot be contacted with the bottom of the water body, so the sand prevention requirement of the bottom of the water body does not need to be considered in the use of the deep-well pump generally. However, in the water source, due to the extreme environmental changes, sand and stone particles often fall into the water source. The deep-well pump is at the during operation, can form the approximate stronger liquid stream in the horizontal direction in the water inlet department of deep-well pump, meets the deep-well pump when the granule sinks and at the during operation, and these sunken granules can be taken to the filter screen by the liquid stream to being held back by the filter screen and plugging up the mesh, thereby can influence the smooth and easy water intake of deep-well pump, and then can influence the work efficiency of deep-well pump.

Chinese patent document (publication No. CN 208778264U) discloses an electric submersible pump with an axial flow type sand-proof structure, which includes a motor, a water pump, and a rotating shaft driven by the motor, wherein an upper bearing seat is provided between the motor and the water pump, a water inlet joint is fixed on the upper bearing seat, an upper bearing seat, a mechanical seal, an axial flow impeller, a shaft sleeve, and an electric pump impeller are sequentially sleeved on the rotating shaft, a flow guide sleeve is fixed on the upper bearing seat, the flow guide sleeve includes an annular outer shell and an annular inner shell which are coaxially arranged, the inner shell is lower than the outer shell, the outer shell is sleeved outside the axial flow impeller, the inner shell is sleeved outside a joint surface of a dynamic ring and a static ring of the mechanical seal, the flow guide sleeve and the axial flow impeller form an axial flow pump, a gap between the outer shell and the inner shell at the lower end of the flow guide sleeve is a water inlet, and the upper end of the flow guide sleeve is a water outlet. This submerged motor pump's axial-flow type sand prevention structure compares in traditional husky cover of getting rid of, and its sand prevention effect is better, improves mechanical seal's life-span, and then has prolonged the life of submerged motor pump.

In the electric pump with the axial flow type sand prevention structure, an inner cylinder and an outer cylinder which are coaxially arranged are arranged on the inner side of a water inlet joint. When the electric pump is used, if external particles fall to a water source and sink, and if the traveling path is close to the water inlet of the water inlet joint, the particles are easily brought into the water inlet joint by water flow and are collected, so that the effect of preventing the external sand particles by the electric pump is not ideal.

Disclosure of Invention

The technical problems to be solved by the invention are as follows: the deep-well pump with the filtering device is capable of well protecting particles falling from the outside to the water surface and convenient to clean.

The technical scheme for solving the technical problem is as follows: a deep well pump with a filtering device comprises a controller, a motor and a water lifting device, wherein the motor is in transmission connection with the water lifting device; the water lifting device is arranged in the upper barrel, the upper barrel and the machine barrel are coaxially connected and fixed through the connecting frame, and a water inlet facing the connecting frame is formed in the upper barrel.

The water lifting device can be a screw rod structure or a plurality of blade structures which are arranged in a staggered mode, and under the driving of the motor, the screw rod or the blades rotate to lift water. The water inlet is generally positioned on the lower end surface of the upper barrel, and after the water lifting device works, water enters the upper barrel from the water inlet and is lifted by the water lifting device. The sand-proof cylinder is a cylinder additionally arranged on the periphery of the existing deep-well pump, and the lower end of the sand-proof cylinder is positioned on the lower side of the water inlet on the upper cylinder.

Furthermore, a water outlet pipe is coaxially arranged at the upper end part of the upper cylinder and communicated with the inside of the upper cylinder, and the sealing structure is fixedly connected on the water outlet pipe. The sealing structure is connected and fixed on the water outlet pipe, so that the sand prevention cylinder is convenient to arrange.

Furthermore, the sealing structure comprises a rubber pad, through holes are formed in the rubber pad along the axial direction of the upper barrel, a nut is buried in the rubber pad, and a screw penetrates through the wall body of the sand prevention barrel and is in threaded connection with the nut. A sand prevention section of thick bamboo couples on the rubber pad through the screw, is convenient for realize fixed to the hookup of a sand prevention section of thick bamboo, and convenient dismantlement to a sand prevention section of thick bamboo to the granule of convenience to the adhesion is cleared up.

Furthermore, the two rubber pads are arranged oppositely, semi-cylindrical grooves are respectively arranged on the opposite side surfaces of the two rubber pads, and the two side surfaces are attached together to enable the two grooves to form the through hole. The rubber pads are arranged into two blocks, so that the rubber pads and the deep-well pump can be conveniently connected and fixed.

Furthermore, the circumferential surface of the rubber pads is provided with a ring groove, the ring groove is internally provided with a hoop, the wall body of the hoop protrudes outwards to form a U-shaped structure, and when the two rubber pads are jointed and fixed, the U-shaped structure is clamped by the clamp to tighten the hoop. The two rubber pads can be fixedly connected through bolts, the two rubber pads are tightly held through the arrangement of the hoop and the operation of the clamp on the hoop, and the two rubber pads are very convenient to connect.

The sand prevention barrel is characterized by further comprising an external induction head, wherein the induction head is electrically connected with the controller through a lead, the lead penetrates through the sealing structure and extends out of the sand prevention barrel, and the induction head corresponds to the upper barrel in position under the suspension of the lead; the upper barrel is electrically connected with the controller. The deep well pump is provided with the induction head, and is used for cutting off a working power supply of the motor by the controller through the isolation of the passage between the induction head and the upper cylinder when the water level of a water source area is reduced, so that the deep well pump stops working, and the deep well pump is prevented from being damaged due to water shortage.

Furthermore, a sand prevention cylinder is electrically connected with the controller, a sheath is sleeved on the periphery of the induction head, a plurality of through openings are formed in the sheath, and the sheath can realize separation between the induction head and the sand prevention cylinder. The sand prevention cylinder is made of stainless steel and is electrically connected with the water outlet pipe through a screw and a nut. The sheath has been cup jointed in the periphery of inductive head, and the sheath is made by insulating material, and the sheath has realized the physics separation between inductive head and the sand prevention section of thick bamboo to take place the mistake touching between inductive head and the sand prevention section of thick bamboo, make after the water level descends certain range, can in time cut off motor working power supply, guaranteed the security of deep well pump work.

Furthermore, the supporting device comprises a cylindrical supporting sleeve, a blocking structure arranged on the machine barrel axially blocks the closed end of the supporting sleeve, the open end of the supporting sleeve supports the supporting structure, and a bearing sleeved on the rotor shaft is arranged on the supporting structure; the outer peripheral surface of the supporting sleeve is attached to the inner peripheral surface of the machine barrel, and the oil passing structure is communicated with two ends of the supporting sleeve. The blocking structure may be an insert disposed within the barrel, and the insert and barrel may be a tight fit, or a threaded connection. The blocking structure can also be a reducing ring formed by reducing the diameter of the cylinder wall body inwards, and the reducing ring provides blocking support for the support sleeve. The supporting sleeve has a certain axial dimension, and the outer peripheral surface of the supporting sleeve is attached to the inner peripheral surface of the machine barrel, so that the supporting sleeve has good radial stability in the machine barrel, and the supporting sleeve can provide good axial support for the rotor shaft. The existence of the supporting sleeve also enables the requirement on the wall thickness of the cylinder to be low, and the supporting sleeve can provide radial support for the cylinder and contribute to the improvement of the strength of the cylinder. The oil passing structure can be an oil groove as described below, and also can be an oil hole arranged at the closed end of the support sleeve, and the flow of lubricating oil is realized by arranging the oil passing structure, so that the working requirement of the deep well pump is met.

Further, the supporting structure comprises a cylindrical supporting cylinder, the bearing is arranged on the inner bottom surface of the supporting cylinder, and the rotor shaft is inserted into the supporting cylinder from the opening end of the supporting cylinder. The cylindrical support barrel can well meet the support requirement of the support sleeve, the radial stability of the support barrel in the machine barrel is good, and the support sleeve and the support barrel are matched, so that a good support effect can be provided for the rotor shaft.

Furthermore, a plurality of notches are arranged on the wall body of the opening end of the supporting sleeve, and oil grooves are arranged on the outer peripheral surface of the supporting sleeve along the axial direction of the supporting sleeve corresponding to the notches. Through the combination of breach and oil groove, and constitute logical oily structure, simple structure can satisfy logical oily effect well.

Compared with the prior art, the invention has the advantages that: the sand-proof cylinder is sleeved on the periphery of the deep-well pump, and the lower end of the sand-proof cylinder extends into the position of the machine barrel. When the deep-well pump works, because of the restriction of the sand prevention barrel, the water flow outside the deep-well pump can not directly enter into the water inlet, and form general powerful water flow outside the pump, because of the dispersion effect of the sand prevention barrel, water enters into the sand prevention barrel from the dispersion of the lower end periphery of the sand prevention barrel, and the water flow needs to be reversed after entering into the sand prevention barrel, thereby the sand prevention effect is ensured in the sand prevention barrel is sucked by the particles which are not easy to cause the sedimentation process outside the pump. In addition, even if a small amount of particles are attracted by the water flow, the particles are easily caught in the gap between the outer cylinder and the inner cylinder, and the sand control cylinder is released for the caught particles in the gap, so that the particles can be easily cleaned. Because the sand prevention effect is good, the water inlet of the deep well pump during working is smooth, and the service life of the water lifting device is ensured. Through being provided with the inductive head for when the water level descends to below the safe water level, can in time cut off the working power supply of motor, improved the work security of deep well pump. Be provided with the strutting arrangement who is used for carrying out axial support to electric motor rotor of cylinder, through supporting the internal face of cover and barrel and laminating mutually, this strutting arrangement can provide good axial supporting role for electric motor rotor to can provide good radial support to the barrel, it is low to the wall body thickness requirement of barrel, can effectively guarantee the intensity of barrel.

Drawings

FIG. 1 is a block diagram of the present deep well pump with the sand control barrel in a cut-away position.

FIG. 2 is a block diagram of the present deep well pump with the sand control barrel removed.

Fig. 3 is a longitudinal sectional view of fig. 2.

Fig. 4 is a perspective view of a single rubber mat.

Fig. 5 is a perspective view of the sheath in one orientation.

Fig. 6 is a perspective view of the sheath in another orientation.

Fig. 7 is a schematic view of the fit between the support sleeve and the support cylinder.

Fig. 8 is a perspective view of the support cover.

FIG. 9 is a perspective view of one embodiment of a support cartridge.

In the figure: 1. a sand control cylinder; 2. a coupling frame; 3. a screw; 4. a rubber pad; 41. a groove; 42. penetrating through the groove; 43. a ring groove; 5. a nut; 6. a water outlet pipe; 7. feeding the cylinder; 8. a barrel; 81. reducing the diameter of the ring; 9. a lifting rope; 10. an inductive head; 11. a wire; 12. a sheath; 121. penetrating through the mouth; 122. embedding; 123. a blocking portion; 13. a screw; 14. a support cylinder; 141. a supporting seat; 142. through holes; 143. a trench; 144. reinforcing ribs; 145. a columnar body; 15. a support sleeve; 151. a notch; 152. an oil sump; 16. a bearing; 17. a rotor shaft.

Detailed Description

The invention will be further explained with reference to the drawings.

In this deep-well pump with filter equipment, filter equipment is used for realizing filtering retardation to the granule in the water, especially retards to the granule of the in-process that sinks from the surface of water. The deep-well pump is suspended at a half-depth position of the water source by a lifting rope 9 when in use, and the deep-well pump does not contact with the bottom of the water source.

In fig. 1, the structure of the deep well pump comprises a motor and a water lifting device, wherein the motor is in transmission connection with the water lifting device, and the water lifting device is a screw 13. The motor is arranged in the machine barrel 8, the screw 13 is arranged in the upper barrel 7, the upper barrel 7 and the machine barrel 8 are coaxially connected and fixed through the frame type connecting frame 2, and a power output shaft of the motor penetrates through the connecting frame 2 to be connected with the screw 17, so that the motor drives the screw 17 to rotate circumferentially to lift water. The upper barrel 7 is provided with a water inlet facing the connecting frame 2, the water inlet is positioned on the lower end surface of the upper barrel 7 and is communicated with the inside of the upper barrel 7, and the position of the connecting frame 2 is provided with an annular filter screen. The stator of the motor is fixed on the inner circumferential surface of the cylinder, and the rotor of the motor is rotatably supported on a support device provided in the cylinder 8. The operation of the motor is controlled by a controller disposed on the underside of the barrel 8, which receives commands to activate the motor or to de-energize the motor.

The structure of the filtering device comprises a sand prevention cylinder 1 sleeved on the peripheral surface of an upper cylinder 7, a sealing structure is arranged between the upper end of the sand prevention cylinder 1 and the upper cylinder 7, and the lower end part of the sand prevention cylinder 1 extends to the lower side of the lower end surface of a machine barrel 8. The sand control barrel 1 is cylindrical, accordingly, the upper barrel 7 and the machine barrel 8 are both cylindrical, and the connecting frame 2 is positioned in the radial range of the upper barrel 7 and the machine barrel 8. The outer diameters of the upper barrel 7 and the cylinder 8 are the same, the inner diameter of the sand control barrel 1 is slightly larger than the outer diameter of the cylinder 8, and the difference between the inner diameter of the sand control barrel 1 and the outer diameter of the cylinder 8 is generally within five millimeters. A gap is formed between the sand control cylinder 1 and the machine barrel 8, so that outside water enters the water inlet from the lower end of the sand control cylinder 1 through the gap.

The sand control cylinder 1 is generally made of stainless steel, the upper end of the sand control cylinder 1 is coupled to the upper cylinder 7 through a sealing structure, the sealing structure realizes the fixation of the sand control cylinder 1 relative to the machine barrel 8, and the sand control cylinder 1 and the machine barrel 8 are coaxially arranged. The upper cylinder 7 is provided with a water outlet pipe 6, the water outlet pipe 6 is communicated with the inside of the upper cylinder 7, the water outlet pipe 6 is coaxially arranged at the upper side of the upper cylinder 7, the sealing structure is directly sleeved and fixed on the water outlet pipe 6, and the water outlet pipe 6 extends out of the upper side of the sealing structure.

The sealing structure is typically a block of non-metallic material that does not require a liquid seal to be achieved, but rather generally requires a barrier to some macroscopic particles. In practical application, the sealing structure is usually a rubber pad 4, a through hole is arranged in the rubber pad 4 along the axial direction of the upper cylinder 7, and the water outlet pipe 6 penetrates through the through hole. A nut 5 is embedded in the rubber pad 4, and a screw 3 penetrates through the wall body of the sand prevention cylinder 1 to be in threaded connection with the nut 5, so that the sand prevention cylinder 1 is fixed on the rubber pad 4. The nut 5 contacts with the water outlet pipe 6 through the rubber pad 4, and the water outlet pipe 6 is electrically connected with the sand-proof cylinder 1 through the nut 5 and the screw 3.

In fig. 4, two rubber pads 4 are shown, and the two rubber pads 4 are opposed to each other to form a single rotation body. The opposite side surfaces of the two rubber pads 4 are respectively provided with a semi-cylindrical groove 41, and the two side surfaces are attached together to ensure that the two grooves 41 form the through hole. When the connection is realized, the two rubber pads 4 surround the periphery of the water outlet pipe 6. The circumferential surface of the rubber pad 4 is provided with a ring groove 43, and the hoop is arranged in the ring groove 43 so that the two rubber pads 4 are attached together. The walls of the hoop protrude outwards to form a pair of U-shaped structures, after the two rubber pads 4 are arranged in place, the U-shaped structures are clamped by using the clamp, so that the walls on two sides of the U-shaped structures on the hoop are pulled inwards, the two rubber pads 4 are tightly held by the hoop, and the connection and fixation between the two rubber pads 4 and the water outlet pipe 6 are realized.

A through groove 42 extending in the axial direction of the upper barrel 7 is provided on the bottom surface of the groove 41, and a lifting rope 9 for lifting the deep-well pump is inserted into the through groove 42 and protrudes from the upper side of the rubber pad 4. The through-groove 42 can also be embedded in other wires 11, so that an external structure is electrically connected with a controller in the deep-well pump.

In order to realize the control of the working state of the deep-well pump, the deep-well pump stops working under the condition that the water level is too low. An external induction head 10 is also arranged on the outer side of the deep-well pump, the induction head 10 is in a capsule shape, the induction head 10 is electrically connected with a controller through a lead 11, the lead 11 is a flexible wire, and the induction head 10 is electrically connected with the lower end part of the lead 11. The lead wire 11 is embedded in the through groove 42 described above and extends from the upper end side of the sand control cylinder 1 to the outside of the sand control cylinder 1. The inductive head 10 is suspended by the wire 11 and corresponds to the position of the upper drum 7, i.e. the inductive head 10 extends into the height range of the upper drum 7 at a vertical height. The periphery of inductive head 10 has the shell of stainless steel material parcel, and wire 11 is connected with the shell electricity of inductive head 10. The upper cylinder 7 is made of metal, and the upper cylinder 7 is electrically connected with the controller through the connecting frame 2 and the machine barrel 8. Due to the presence of the screw 3 and the nut 5, the sand control cylinder 1 can be electrically connected with the controller.

After the deep-well pump is put into the water body, a passage can be formed between the induction head 10 and the sand prevention cylinder 1 due to the existence of water, which is a precondition for the controller to start the motor to work. If the water is deficient, a channel cannot be formed between the induction head 10 and the sand prevention cylinder 1, the precondition that the controller starts the motor to work is lacked, and the motor cannot work, so that the deep well pump is well protected under the condition of water deficiency.

In order to form absolute separation between the induction head 10 and the sand prevention cylinder 1, a sheath 12 made of an insulating material is sleeved on the periphery of the induction head 10, a plurality of through openings 121 are formed in the sheath 12, and the shell of the induction head 10 is exposed through the through openings 121. The wall of the sheath 12 has a certain thickness, and in the use state, the sheath 12 is leaned on the outer circumference of the sand control cylinder 1, so that the induction head 10 is separated from the sand control cylinder 1.

The sheath 12 is formed by injection molding of plastic or rubber material, the sheath 12 is provided with an embedding opening 122 along the length direction thereof, the embedding opening 122 extends along the whole length direction of the sheath 12, and two ends of the embedding opening 122 are respectively located at two ends of the sheath 12 in the length direction. Blocking parts 123 are formed at both ends of the insertion opening 122, the blocking parts 123 extend along the inner wall surface of the insertion opening 122, and the blocking parts 123 are U-shaped or C-shaped. After the inductive head 10 is inserted into the sheath 12 from the insertion opening 122, the two blocking portions 123 respectively contact with the two ends of the inductive head 10, so that the inductive head 10 can be stably held in the sheath 12.

Support means are provided in the barrel 8 for supporting the rotor shaft 17 on the rotor of the motor. A supporting structure is arranged in the machine barrel 8, a bearing 16 sleeved on a rotor shaft 17 is arranged in the supporting structure, and the rotor shaft 17 is supported by the bearing 16 to realize axial fixation and circumferential rotation.

A cylindrical support sleeve 15 is arranged in the machine barrel 8, one end of the support sleeve 15 is open, the other end of the support sleeve 15 is closed, the support sleeve and the machine barrel are connected into a whole, and the thickness of a wall body of the support sleeve 15 is gradually increased from one end to the other end. After the supporting sleeve 15 is arranged in the machine barrel 8, the outer peripheral surface of the supporting sleeve is attached to the inner peripheral surface of the machine barrel 8, and the supporting sleeve 15 is provided with an oil passing structure which is communicated with two axial ends of the supporting sleeve 15.

A stop structure is provided on the barrel 8 on the underside of the support sleeve 15, which support structure is supported by one end of the support sleeve 15 and is supported by the other end of the support sleeve 15. In fig. 3, the blocking structure is shown as a reducing ring 81 formed on barrel 8, where reducing ring 81 is formed by inward contraction of the wall of barrel 8.

Referring to fig. 7 and 8, a plurality of notches 151 are formed at one end of the support sleeve 15, the oil passing structure is an oil groove 152 disposed on the outer circumferential surface of the support sleeve 15, and the oil groove 152 is disposed corresponding to the notches 151. The lubricating oil is allowed to flow between the indentations 151 and the bottom side of the support sleeve 15 through the oil grooves 152.

Referring to fig. 3, the support structure includes a cylindrical support cylinder 14, one end of the support cylinder 14 is open, the other end is closed, the closed end of the support cylinder 14 faces one end of the support sleeve 15, and the closed end of the support cylinder 14 is in contact with one end of the support sleeve 15. The bearing 16 is provided on the inner bottom surface of the support cylinder 14, and the rotor shaft 17 is inserted into the support cylinder 14 from the open end of the support cylinder 14.

As an example, a plurality of grooves 143 are provided on the outer circumferential surface of the support cylinder 14 in the axial direction thereof, both ends of the grooves 143 are respectively located at both end positions of the support cylinder 14, and the lubricating oil can flow between the rotor and the support sleeve 16 through the grooves 143. In order to ensure the strength of the lower end of the support cylinder 14, a plurality of protruding, strip-shaped reinforcing ribs 144 are integrally formed on the outer bottom surface of the support cylinder 14, the reinforcing ribs 144 are arranged in a crossing manner in the radial direction of the outer bottom surface of the support cylinder 13, and the crossing point of the reinforcing ribs 144 is located at the center of the lower bottom surface of the support cylinder 14. In this embodiment, the rotor shaft 17 is supported by the bottom of the supporting cylinder 14, two protruding columns 145 are integrally formed on the outer bottom surface of the supporting cylinder 14, a threaded hole is formed in the inner bottom surface of the supporting cylinder 14 at the position of the column 145, and a corresponding supporting structure can be fixed to the inner bottom surface of the supporting cylinder 13 by screwing a bolt into the threaded hole, so as to axially support and fix the rotor shaft 17.

Referring to fig. 7, as another embodiment, a protruding support seat 141 is integrally formed on the inner bottom surface of the support cylinder 14, the support seat 141 is circular, and a through hole 142 is provided at a position of the support seat 141 on the inner bottom surface of the support cylinder 14. The bearing 16 is inserted into the support 141, and the through hole 142 allows the lubricant to flow therethrough.